Logic board repair need help A1278 2008 820-2327

I hope somebody can give me some hints about an old Macbook A1278 2008 mobo 820-2327 with the following strange symptoms: dim green light on magsafe, powers only with the battery on on charges normally but no power with the magsafe only. The problem was caused by a "fried" magsafe adapter and i still didn't figure out what is the problem.

I made some reading around the sys one wire circuit as follows:
It is clear that there is something wrong around the Q6910 MOSFET but due my lack of knowledge
on electronics i didn't figured out if this is due to a wrong voltage coming from the SMC_BC_ACOK
or it is just blown itself...

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